Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
tay lang » tai lang, tay tang, tay quang
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
cam tuc » cam tu, nam thuc, dam thuc
dat cua » dai cua, day cua, mat cua
y lang » o lang, _ lang, yen lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((y lang) or (tay lang)) xa hoi. hieu van ((cam tuc) OR (cam xuc)) gia thanh dat cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y lang) OR (tay lang)) xa hoi. hieu van ((cam tuc) OR (cam xuc)) gia thanh dat cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y lang) or (tay lang)) xa hoi. hieu van ((cam tuc) OR (cam xuc)) gia thanh dat cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y lang) or (tay lang)) xa hoi. hieu van ((cam tuc) OR (cam xuc)) gia thanh dat cua viet*.